摘要
【目的】比较研究露地条件与设施条件下阿维菌素在蔬菜作物上消解动态差异。【方法】采用柱前衍生高效液相色谱法分别测定露地条件和大棚条件下1.8%阿维菌素乳油制剂在西兰花和甘蓝上的残留降解动态和最终残留量。【结果】按推荐使用剂量(4000×)、2倍推荐使用剂量(2000×)、4倍推荐使用剂量(1000×)使用后,露地条件下阿维菌素在西兰花上的起始浓度分别为113.89、256.74、785.73μg·kg-1,降解半衰期分别为1.63、1.46和2.16d;在甘蓝上的起始浓度分别为53.04、138.42、353.18μg·kg-1,降解半衰期分别为1.67、1.42和1.77d。大棚条件下阿维菌素在西兰花上的起始浓度分别为133.00、372.27、1060.74μg·kg-1,降解半衰期分别为5.49、5.23和5.33d;在甘蓝上的起始浓度分别为73.70、201.04、502.76μg·kg-1,降解半衰期分别为4.59、4.53和4.43d。【结论】阿维菌素在大棚条件下使用时在蔬菜作物上的起始浓度(C0)均明显大于露地条件的相应值,它们比在露天条件下更难降解,降解半衰期更长。
[Objective] For comparative study of abamectin residues degradation in open field and greenhouse vegetables. [Method] The residue dynamics and final residues were investigated by HPLC with pre-column fluorescent derivation after 1.8% abamcetin （EC） was applied on cauliflowers and cabbages. [Result] The results showed that the initiative concentrations of abamectin in cauliflowers were 113.89, 256.74, and 785.73 μg·kg^-1 and their half-lives were 1.63, 1.46, and 2.16 d, respectively, when the 1.8% abamectin （EC） was applied in open field by the dilution times of 4 000, 2 000 and 1 000, and that in cabbages were 53.04, 138.42, and 353.18 μg·kg^-1 and 1.67, 1.42, and 1.77 d, respectively. While abamectin was used in greenhouse by the same concentrations, the initiative P concentrations of abamectin in cauliflowers were 133.00, 372.27, and 1 060.74 μg·kg^-1 and their half-lives were 5.49, 5.23, and 5.33 d, respectively, and that in cabbages were 73.70, 201.04, and 502.76μg·kg^-1 and 4.59, 4.53, and 4.43 d, respectively. [Conclusion] Contrasting both data, it could be concluded that the initiative concentrations of abamectin in greenhouse vegetables were always higher than that in open field vegetables, and its half-lives in greenhouse were longer than that in open field, which implied that abamectin in greenhouse was more slow to be degraded than that in open field.
出处
《中国农业科学》
CAS
CSCD
北大核心
2008年第10期3399-3404,共6页
Scientia Agricultura Sinica
基金
上海市科技兴农重点攻关项目(沪农科攻字2003第10-6号)
